They have a 24 hour front desk, no need to worry about checking in (i stayed in service apartments before this, so everything was self-check in). They didn't have a hair dryer in the room but they'll bring you one if you just dial 100 and call the front desk. Everything else was fine and as advertised.
Oh but the roads around here are REALLY BUSY so if you walk around a lot like me, you'll have to take note of that and be prepared to brave the traffic. Nearest convenience store that didn't require me to cross the road was a 7-eleven to the north, 8 mins walk. You'll also pass by a Korean mart on the way there.